Raman scattering study of the geometrically frustrated pyrochlore Y2Ru2O7

J. S. Bae, In Sang Yang, J. S. Lee, T. W. Noh, T. Takeda, R. Kanno

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Geometrically frustrated pyrochlore Y2Ru2O7, which shows a spin-glass-like transition at TG ∼ 80 K, were investigated by temperature-dependent Raman scattering. Three discernable phonons appear around 315, 410, and 510 cm-1 without any abrupt change in the number of Raman active modes within the temperature range of 10-300 K. Fitting each phonon with Lorentz oscillators, we analyzed the effects of temperature on the phonon frequencies and the linewidths. The temperature-dependence of the mode near 510 cm-1 shows abnormal behavior below TG, while the other two phonons follow the usual thermal effect of lattice vibration. This behavior can be understood in terms of spin-phonon coupling. Considering the atomic modulations of each phonon mode, it is conjectured that the 510 cm-1 phonon mode is isotropically coupled to the spin degree of freedom, while the other modes are not.

Original languageEnglish
Pages (from-to)284-287
Number of pages4
JournalVibrational Spectroscopy
Issue number2
StatePublished - 24 Nov 2006


  • Geometrically frustrated
  • Phrochlore YRuO
  • Raman scattering


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